A STUDY OF PURSUIT EYE MOVEMENT

Abstract

Horizontal pursit eye movements were recorded by electronystagmography using silver plate electrodes in 30 normal subjects. The target movements: 1) circular, square ane diamond, 2) clockwise and counterclockwise. The speeds of the target were 0.1Hz, 0.25Hz and 0.5Hz. The saccades to the right or left were counted during ten cycles of the target movements.
When the targets moved clockwise or counterclockwise, there were no significant difference of the mean value of the saccades. The mean value of the saccades when the target moved clockwise was smaller than that when the target moved counterclockwise. Most smooth pursuit movements appeared when the target moved clockwise with the speed of 0.25Hz.
Pursuit eye movements were recorded while white noises were given to the right or left ear. The mean value of the saccades when the white noise was given to the ear were smaller than the mean value of the saccades without white noise. However, there was no significant difference between the right ear and the left ear when the white noise was given.
Also, pursuit eye movements were recorded while speech discrimination test was performed to the right or left ear. There was no significant difference between the right ear and the left ear.